EP2386727A1 - Turboexpander for power generation systems - Google Patents

Turboexpander for power generation systems Download PDF

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Publication number
EP2386727A1
EP2386727A1 EP11165924A EP11165924A EP2386727A1 EP 2386727 A1 EP2386727 A1 EP 2386727A1 EP 11165924 A EP11165924 A EP 11165924A EP 11165924 A EP11165924 A EP 11165924A EP 2386727 A1 EP2386727 A1 EP 2386727A1
Authority
EP
European Patent Office
Prior art keywords
fluid
section
expander
turboexpander
motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11165924A
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German (de)
English (en)
French (fr)
Inventor
Giacomo Landi
Alberto Scotti Del Greco
Sergio Palomba
Gabriele Mariotti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nuovo Pignone SpA
Original Assignee
Nuovo Pignone SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nuovo Pignone SpA filed Critical Nuovo Pignone SpA
Publication of EP2386727A1 publication Critical patent/EP2386727A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/08—Cooling; Heating; Heat-insulation
    • F01D25/10—Heating, e.g. warming-up before starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/02—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for the fluid remaining in the liquid phase
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
    • F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/14—Combined heat and power generation [CHP]

Definitions

  • the embodiments of the subject matter disclosed herein generally relate to power generation systems and more particularly to turboexpanders.
  • Rankine cycles use a working fluid in a closed-cycle to gather heat from a heating source or a hot reservoir by generating a hot gaseous stream that expands through a turbine to generate power.
  • the expanded stream is condensed in a condenser by transferring heat to a cold reservoir and pumped up to a heating pressure again to complete the cycle.
  • Power generation systems such as gas turbines or reciprocating engines (primary system) produce hot exhaust gases that are either used in a subsequent power production process (by a secondary system) or lost as waste heat to the ambient.
  • the exhaust of a large engine may be recovered in a waste heat recovery system used for production of additional power, thus improving the overall system efficiency.
  • a common waste heat power generation system operating in a Rankine cycle is shown in Figure 1 .
  • the power generation system 100 includes a heat exchanger 2, also known as a boiler or evaporator, an expander 4, a condenser 6 and a pump 8.
  • a heat exchanger 2 also known as a boiler or evaporator
  • an expander 4 heats the heat exchanger 2.
  • This causes the received pressurized liquid medium 12 to turn into a pressurized vapor 14, which flows to the expander 4.
  • the expander 4 receives the pressurized vapor stream 14 and can generate power 16 as the pressurized vapor expands.
  • the expanded lower pressure vapor stream 18 released by the expander 4 enters the condenser 6, which condenses the expanded lower pressure vapor stream 18 into a lower pressure liquid stream 20.
  • the lower pressure liquid stream 20 then enters the pump 8, which both generates the higher pressure liquid stream 12 and keeps the closed loop system flowing.
  • the higher pressure liquid stream 12 then flows in to the heat exchanger 2 to continue this process.
  • One working fluid that can be used in a Rankine cycle is an organic working fluid.
  • ORC organic Rankine cycle
  • ORC systems have been deployed as retrofits for engines as well as for small-scale and medium-scale gas turbines, to capture waste heat from the hot flue gas stream. This waste heat may be used in a secondary power generation system to generate up to an additional 20% power in addition to the power delivered by the engine producing the hot flue gases alone.
  • ORC fluid may get into direct contact with the high-temperature gas turbine exhaust gasses (approx. 500 degrees Celsius)
  • measures need to be taken to avoid a direct contact between the ORC fluid (e.g., cyclopentane) and the gas turbine exhaust gasses.
  • a method currently used for limiting the surface temperature of the heat exchanging surfaces in an evaporator which contains the ORC working fluids is to introduce an intermediate thermo-oil loop into the heat exchange system, i.e., to avoid the ORC fluid circulating through the exhaust stack of the gas turbine.
  • the intermediate thermo-oil loop can be used between the hot flue gas and the vaporizable ORC fluid.
  • the intermediate thermo-oil loop is used as an intermediate heat exchanger, i.e., heat is transferred from the hot flue gas to the oil, which is in its own closed loop system, and then from the oil to the ORC fluid using a separate heat exchanger as shown in dual fluid heat exchange circuit 200 of Figure 2 .
  • oil is pumped from an oil storage unit 206 via a pump 208 through a heat exchanger 210.
  • Heat is introduced as an exhaust of, for example, turbine 202, and is exhausted through the heat exchanger 210 and out the exhaust stack 204.
  • thermo-oil loop 2208 The now heated oil continues, in the thermo-oil loop 228, on to a vaporizer 212 which evaporates the ORC fluid, which is located in a second self contained fluid circuit 226, and continues on through preheater elements 214 which cool the oil and preheat the ORC fluid, prior to the oil returning to the oil storage container 206.
  • a lower pressure ORC liquid stream enters the pump 216, which both generates a higher pressure ORC liquid stream and keeps the closed loop system flowing.
  • the higher pressure ORC liquid stream then is pumped through a recuperator 218 and preheaters 214 prior to evaporation at the heat exchanger/evaporator 212. This causes the received pressurized ORC liquid medium 12 to turn into a pressurized ORC vapor, which flows to an expander 220 which is mechanically coupled to generator 222 (or the like).
  • the expander 220 receives the pressurized ORC vapor stream for assisting in the creation of power and creates an expanded lower pressure ORC vapor stream which continues on back through the recuperator 218 and onto the condenser 224, which condenses the expanded lower pressure ORC vapor stream into a lower pressure ORC liquid stream.
  • the intermediate thermo-oil loop allows for separating the ORC fluid from direct exposure to the hot flue gas. Additionally, while the oil used in the intermediate thermo-oil loop is flammable, this oil is generally less flammable than ORC working fluids. However, this thermal oil system takes additional physical space and can represent up to one quarter of the cost of an ORC system.
  • a generator 222 can be mechanically linked to the expander section 220 to create power for use.
  • One method for connecting an expander section to a generator is shown in Figure 3 .
  • expander 220 includes a shaft 302 which rotates during fluid expansion. This shaft 302 connects to a gear box 304 which translates the mechanical energy into the desired rotation rate for the generator 222. This rotation rate and associated energy is transmitted via shaft 306 from the gear box 304 to the generator 222.
  • dry gas seals 308 are provided to keep the ORC fluid (or other medium used in a Rankine cycle) from escaping into the atmosphere through the shaft 302's entrance point into the expander 220.
  • Dry gas seals can be described as non-contacting, dry-running mechanical face seals which include a mating or rotating ring and a primary or stationary ring. In operation, grooves in the rotating ring generate a fluid-dynamic force causing the stationary ring to separate and create a gap between the two rings. These seals are referred to as "dry” since they do not require lubricating oil which, among other things, greatly reduces their maintenance requirements. As in many mechanical processes, simplifying the systems and/or reducing the number of components can reduce cost. Accordingly, systems and methods for reducing the footprint and cost of power generation systems are desirable.
  • a turboexpander configured to include an expander section, a pump section and a motor-generator section which are mechanically linked via a shaft;
  • the expander section is fluidly connected to an outlet side of a heat exchanger and configured to receive a vapor stream of a fluid, to rotate the shaft and to generate an expanded vapor stream of the fluid;
  • the pump section is fluidly connected to an outlet side of a condenser and configured to receive a liquid stream of the fluid, to pressurize the liquid stream of the fluid and to circulate the fluid in the power generation system;
  • the motor-generator section is configured to generate and output an electrical current.
  • the turboexpander includes: a turboexpander to only include an expander section, a pump section and a motor-generator section which are mechanically linked via a shaft and only two fluid inlets and only two fluid outlets, wherein the turboexpander does not include a compressor section; the expander section is fluidly connected to an outlet side of a heat exchanger and configured to receive a vapor stream of a fluid, to rotate the shaft and to generate an expanded vapor stream of the fluid, wherein the expander stage includes one or more expansion stages; the pump section is fluidly connected to an outlet side of a condenser and configured to receive a liquid stream of the fluid, to pressurize the liquid stream of the fluid and to circulate the fluid in the power generation system, wherein the pump section includes one or more pump stages; the motor-generator section configured to generate and output an electrical current; the condenser is fluidly connected to an outlet side of the expander and configured to receive and condense the expanded vapor
  • the system includes: a turboexpander to only include an expander section, a pump section and a motor-generator section which are mechanically linked via a shaft, the turboexpander having only two fluid inlets and only two fluid outlets, and does not include a compressor section;
  • the expander section is fluidly connected to an outlet side of a heat exchanger and configured to receive a vapor stream of a fluid, to rotate the shaft and to generate an expanded vapor stream of the fluid, wherein the expander stage includes one or more expansion stages;
  • the pump section is fluidly connected to an outlet side of a condenser and configured to receive a liquid stream of the fluid, to pressurize the liquid stream of the fluid and to circulate the fluid in the power generation system, wherein the pump section includes one or more pump stages;
  • the motor-generator section configured to generate and output an electrical current;
  • the condenser is fluidly connected to an outlet side of the expander and configured to receive and condense the expanded vapor stream of the
  • a Rankine cycle can be used in power generation systems to capture a portion of the waste heat energy.
  • a secondary system can be used to capture a portion of the wasted energy from the primary system that wastes the energy.
  • components used in power generation can be combined to reduce costs and footprint size and to prevent the release of polluting substances into the environment while still efficiently generate power as shown in Figure 4 .
  • a power generation system 400 illustrated in Figure 4 includes a heat exchanger 410, a turboexpander 402 (having an expander section 404, a motor-generation section 406, and a pump section 408), a condenser 224 and a recuperator 218. Describing this closed loop system, beginning with the heat exchanger 410, exhaust gases from the turbine 202 flow past and heat the heat exchanger 410 prior to exiting the exhaust stack 204. This causes a pressurized liquid medium to turn into a pressurized vapor which flows to the expander section 404 of the turboexpander 402.
  • the expander section 404 receives the pressurized vapor stream which rotates an impeller attached to a shaft (shown in Figure 7 ) as the pressurized vapor expands which allows the motor-generator section 406 of the turboexpander 402 to generate electrical current.
  • the shaft of the expander section 404 is also the shaft of the motor-generator 406.
  • the shaft is shared with a pump section 408 of the turboexpander 402 for providing the energy used by the pump section 408 to pressurize the liquid medium.
  • each section has its own shaft but all these shafts are connected to each other and rotate together.
  • the expanded lower pressure vapor stream released by the expander section 404 flows through the recuperator 218 for heat exchange and then enters a condenser 224, which condenses the expanded lower pressure vapor stream into a lower pressure liquid stream.
  • the lower pressure liquid stream then enters the pump section 408 of the turboexpander 402, which both generates the higher pressure liquid stream and keeps the closed loop system flowing.
  • the higher pressure liquid stream then is pumped to the heat exchanger 410 to continue this process.
  • a portion of the higher pressure liquid stream may be split and used to cool the motor-generator section 406 as shown by the line 412.
  • the higher pressure liquid stream passes recuperator 218 and cools the stream from the expander section 404. Also shown in Figure 4 are the relative pressures at various stages of the cycle, with P o > P 1 >P 2 .
  • the turboexpander 504 can include two expansion stages 404 and 502 as shown in Figure 5 .
  • the exemplary power generation system 500 operates in a similar manner to the power generation system 400 shown in Figure 4 .
  • the turboexpander 504 going from right to left in Figure 5 , has a first expansion section 404, a motor-generator section 406, a second expansion section 502 and a pump section 408.
  • the process gas is split prior to entering the turboexpander 504 such that both expander sections receive the process gas for expansion.
  • a portion of the higher pressure liquid stream is split and used to cool the motor-generator section 406 as shown by the line 412.
  • Also shown in Figure 5 are the relative pressures at various stages of the cycle, with P o > P 1 > P 2 .
  • one working fluid that can be used in a Rankine cycle is an organic working fluid such as an organic Rankine cycle (ORC) fluid.
  • ORC fluids include, but are not limited to, pentane, propane, cyclohexane, cyclopentane, butane, a fluorohydrocarbon such as R-245fa, a ketone such as acetone or an aromatic such as toluene or thiophene.
  • ORC organic Rankine cycle
  • ORC fluids include, but are not limited to, pentane, propane, cyclohexane, cyclopentane, butane, a fluorohydrocarbon such as R-245fa, a ketone such as acetone or an aromatic such as toluene or thiophene.
  • R-245fa fluorohydrocarbon
  • ketone such as acetone
  • aromatic such as toluene or thiophene.
  • turboexpander 402 includes an expander section 404, a motor-generator section 406 and a pump section 408.
  • the turboexpander 402 is an integrated unit which is sealed such that no rotating parts cross the sealed casing of the turboexpander 402. This allows for the elimination of dry gas seals in the turboexpander 402 between the expander section and the generator.
  • the three sections of the turboexpander 402 are mechanically linked via a shaft 616 which may be three separate but mechanically linked shafts.
  • the expander section 404 can have a shaft 610 which is mechanically attached to a shaft 612 in the motor-generator section 406, with the shaft 612 being mechanically linked to a shaft 614 in the pump section 408.
  • shafts 610, 612, and 614 are integrally manufactured as a single shaft.
  • Both the pump section 408 and the expander section 404 can have multiple stages, e.g., two or more stages. Since turboexpander 402 is an integrated unit, there is no need for a gearbox (and the gearbox's associated lubrication system) to exist between the expander section 402 and the motor generator section 404.
  • These exemplary embodiments also can be obtained from the turboexpander 504 shown in Figure 5 by combining exemplary embodiments, i.e., using a single shaft or four mechanically linked shafts in the turboexpander 504.
  • the turboexpander 402 can have only two fluid inlets 602, 606 and only two fluid outlets 604, 608. By having these four fluid inlets/outlets in the turboexpander 402 the loss of process gas to the environment is greatly reduced from traditional systems, e.g., turboexpander 402 does not include the traditional environmental seals which are prone to hazardous gas leakages. Additionally, by having the exemplary turboexpander 402 as described herein, shipping weight and plant footprint size are both reduced when compared to a traditional power generation system.
  • turboexpander 504 can have the expansion stages receive the process gas in series as shown in Figure 8.
  • Figure 8 shows the first expansion section 404 receiving the process gas from piping 802. After expansion, the process gas leaves the first expansion section 404 and goes to the second expansion section 502 as shown by piping 804. After this expansion, the process gas exits the second expansion stage 502 as shown by piping 806. Pressures in this system are characterized by relationship P o > P 1 > P 2 > P 3 .
  • the motor-generator section 406 can be a high speed generator, e.g., a 3 MW and/or a 6 MW.
  • This motor-generator 406 can operate at a same rotation speed generated by the expander section 404 which allows for the non-inclusion of a gear box.
  • An output of the motor-generator 406 can be a direct current or an alternating current.
  • magnetic bearings can be used in the motor-generator 406.
  • oil lubrication can be used instead of magnetic bearings in the motor-generator 406.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Control Of Eletrric Generators (AREA)
  • Inorganic Insulating Materials (AREA)
  • Catalysts (AREA)
EP11165924A 2010-05-14 2011-05-12 Turboexpander for power generation systems Withdrawn EP2386727A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITCO2010A000026A IT1399882B1 (it) 2010-05-14 2010-05-14 Turboespansore per sistemi di generazione di potenza

Publications (1)

Publication Number Publication Date
EP2386727A1 true EP2386727A1 (en) 2011-11-16

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EP11165924A Withdrawn EP2386727A1 (en) 2010-05-14 2011-05-12 Turboexpander for power generation systems

Country Status (9)

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US (1) US20110278846A1 (ja)
EP (1) EP2386727A1 (ja)
JP (1) JP2011241830A (ja)
KR (1) KR20110126056A (ja)
CN (1) CN102322300A (ja)
CA (1) CA2739230A1 (ja)
IT (1) IT1399882B1 (ja)
MX (1) MX2011005130A (ja)
RU (1) RU2568378C2 (ja)

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WO2020201843A1 (en) 2019-04-05 2020-10-08 Atlas Copco Airpower, Naamloze Vennootschap Power generation system and method to generate power by operation of such power generation system
BE1027172A1 (nl) 2019-04-05 2020-10-27 Atlas Copco Airpower Nv Systeem voor vermogensopwekking en werkwijze voor het opwekken van vermogen door gebruik van dergelijk systeem voor vermogensopwekking

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CA2739230A1 (en) 2011-11-14
RU2568378C2 (ru) 2015-11-20
ITCO20100026A1 (it) 2011-11-15
RU2011118724A (ru) 2012-11-20
JP2011241830A (ja) 2011-12-01
US20110278846A1 (en) 2011-11-17
KR20110126056A (ko) 2011-11-22

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